Numerical Simulation Research on the Displacement of Ground Connecting Wall in Geological Excavation and Soil Remediation

Abstract

Monitoring the changes of the retaining pile wall during the excavation of the deep foundation pit, and accurately grasping the side displacement changes of the retaining pile wall can effectively grasp the safety status of the foundation pit construction. In this paper, taking Guangfo Ring Road as an example, theoretical analysis, numerical simulation and other methods are used to study the influence of foundation pit excavation on the horizontal displacement and deformation of the ground connecting wall during the reinforcement of mixed piles in the area adjacent to high-rise buildings. Get the following conclusion : (1) With reinforced ground connecting walls and non-reinforced ground connecting walls, the horizontal displacement curve of ground connecting walls is roughly the same, showing a trend of change between the larger and the smaller ends. As the excavation depth continues to increase, the changing trend of the “bow” becomes more obvious, which is in line with the changing law of the enclosure structure. (2) After the mixing pile is used for reinforcement, the maximum horizontal displacement of the ground connecting wall is greatly reduced. Compared with the case without reinforcement measures, the horizontal displacement value of the ground connecting wall is 5.66mm, which is reduced by 6.23mm. The reduction ratio is 52%, indicating that the mixing pile has a great inhibitory effect on the horizontal displacement of the ground connecting wall. (3) By comparing on-site monitoring and numerical calculation data, the change trend of the wall horizontal displacement of the measured value and the simulated value is approximately the same. The measured maximum value of the monitoring section is 8.46mm, the simulated maximum value is 5.66mm, and the difference between the two is 2.8 mm, verified the rationality of the model, and provided some experience for the excavation of foundation pits to protect adjacent buildings.